| Term 
 
        | atria eject blood into ventricles (EDV) 
 what happens after this step?
 |  | Definition 
 | 
        |  | 
        
        | Term 
 | Definition 
 
        | Atrial systole: atrial contraction begins
 |  | 
        |  | 
        
        | Term 
 
        | AV valves close 
 what happens after this step?
 |  | Definition 
 
        | Ventricular systole: isovolumetric ventricular contraction
 |  | 
        |  | 
        
        | Term 
 
        | atrial contraction begins 
 what happens after this step?
 |  | Definition 
 
        | atria eject blood into ventricles (EDV) |  | 
        |  | 
        
        | Term 
 
        | Ventricular systole: isovolumetric ventricular contraction
 
 what happens after this?
 |  | Definition 
 
        | ventricles eject blood through semilunar valves |  | 
        |  | 
        
        | Term 
 
        | ventricles eject blood through semilunar valves 
 what happens after this step?
 |  | Definition 
 
        | semilunar valves close (S2) |  | 
        |  | 
        
        | Term 
 
        | semilunar valves close (S2) 
 What happens after this step?
 |  | Definition 
 
        | ventricular diastole 
 high ventricular pressure
 low atrial pressure
 isovoulmetric relaxation
 All valves CLOSED
 
 high atrial pressure
 passive atrial and ventricular filling
 AV valve OPEN
 |  | 
        |  |